.bottom-img{
    max-width: 200px;
    max-height:300px;
}

.welcome-img{
    margin: auto 0;
    max-width: 200px;
}

#top{
    width: 100%;
    height: 120px;
    background-image: url(../images/IMG_0162.PNG);
    background-size: cover;
    padding-bottom:4px ;
    border-bottom: darkgreen solid 2px;
}

.nav{
    height: 40px;
    padding-left: 100px;
    padding-top: 88px;
    margin: 0; 
}

.nav-select{
    width: 140px;
    height: 30px;
    text-align: center;
    display: inline-block;
    font-family: 微软雅黑;
    font-size: 20px;
    font-weight: 500;
    color:white;
    padding-top: 2px;
    padding-bottom: 2px;
    border-radius: 5px 5px 0 0;
}

.nav-user{
    width: 160px;
    height: 30px;
    text-align: center;
    display: inline-block;
    position: absolute;
    right: 5px;
    font-family: 微软雅黑;
    font-size: 16px;
    color:white;
    padding-top: 6px;
    padding-bottom: 2px;
}

.nav-select:hover,.nav-select:active{
    background-color: rgb(168, 31, 31);
    color: white;
    border-bottom: darkgreen solid 4px;
    cursor: pointer;
}

.selected{
    background-color: rgb(168, 31, 31);
    color: white;
    border-bottom: darkgreen solid 4px;
}

#goods{
    margin-left: 10%;
    width: 50%;
    height: 400px;
}

#chat{
    height: 400px;
    width: 200px;
    vertical-align: top;
    border: solid 1px black;
}

